I work for medical clinic with about 600 users. For almost 2 years now, we have been having issues where wireless callers from T-Mobile/Mint/Metro PCS and all of their MVNOs, have the inability to get through our IVR system. They will push options in our main auto attendant IVR and it will not register anything they press. Sometimes it will take multiple calls before finally, they are able to transmit tones. I am able to duplicate this issue on my T-Mobile test line on my iphone (signed up for the 90 day evaluation) as well as a test android phone. Wifi calling disabled, strong LTE or 5G signal. Issue happens all over our City, and some of the surrounding cities. Both phones (iphone 14 Pro Max and T-Mobile Revl and OnePlus N200, all the latest ios and carrier updates). Our support vendor for our phone system and our SIP carrier keep telling us the issue is on T-Mobile's side. I had worked with T-Mobile support for several weeks, and they tried to blame the issue on iPhone, stating that
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